2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Keith Muller of the University of California, San Diego and Lance
7 * Visser of Convex Computer Corporation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)conv.c 8.3 (Berkeley) 4/2/94
38 * $FreeBSD: src/bin/dd/conv.c,v 1.15 1999/09/13 21:47:10 green Exp $
39 * $DragonFly: src/bin/dd/conv.c,v 1.4 2004/01/28 16:25:29 joerg Exp $
42 #include <sys/param.h>
52 * Copy input to output. Input is buffered until reaches obs, and then
53 * output until less than obs remains. Only a single buffer is used.
54 * Worst case buffer calculation is (ibs + obs - 1).
63 if ((t = ctab) != NULL)
64 for (inp = in.dbp - (cnt = in.dbrcnt); cnt--; ++inp)
67 /* Make the output buffer look right. */
71 if (in.dbcnt >= out.dbsz) {
72 /* If the output buffer is full, write it. */
76 * Ddout copies the leftover output to the beginning of
77 * the buffer and resets the output buffer. Reset the
78 * input buffer to match it.
88 /* Just update the count, everything is already in the buffer. */
94 * Copy variable length newline terminated records with a max size cbsz
95 * bytes to output. Records less than cbs are padded with spaces.
97 * max in buffer: MAX(ibs, cbsz)
98 * max out buffer: obs + cbsz
110 * Record truncation can cross block boundaries. If currently in a
111 * truncation state, keep tossing characters until reach a newline.
112 * Start at the beginning of the buffer, as the input buffer is always
116 for (inp = in.db, cnt = in.dbrcnt; cnt && *inp++ != '\n'; --cnt)
124 /* Adjust the input buffer numbers. */
126 in.dbp = inp + cnt - 1;
130 * Copy records (max cbsz size chunks) into the output buffer. The
131 * translation is done as we copy into the output buffer.
134 for (inp = in.dbp - in.dbcnt, outp = out.dbp; in.dbcnt;) {
135 maxlen = MIN(cbsz, in.dbcnt);
136 if ((t = ctab) != NULL)
137 for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n';
141 for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n';
145 * Check for short record without a newline. Reassemble the
148 if (ch != '\n' && in.dbcnt < cbsz) {
149 (void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
153 /* Adjust the input buffer numbers. */
158 /* Pad short records with spaces. */
160 (void)memset(outp, ctab ? ctab[' '] : ' ', cbsz - cnt);
163 * If the next character wouldn't have ended the
164 * block, it's a truncation.
166 if (!in.dbcnt || *inp != '\n')
169 /* Toss characters to a newline. */
170 for (; in.dbcnt && *inp++ != '\n'; --in.dbcnt);
177 /* Adjust output buffer numbers. */
179 if ((out.dbcnt += cbsz) >= out.dbsz)
183 in.dbp = in.db + in.dbcnt;
190 * Copy any remaining data into the output buffer and pad to a record.
191 * Don't worry about truncation or translation, the input buffer is
192 * always empty when truncating, and no characters have been added for
193 * translation. The bottom line is that anything left in the input
194 * buffer is a truncated record. Anything left in the output buffer
195 * just wasn't big enough.
199 (void)memmove(out.dbp, in.dbp - in.dbcnt, in.dbcnt);
200 (void)memset(out.dbp + in.dbcnt, ctab ? ctab[' '] : ' ',
207 * Convert fixed length (cbsz) records to variable length. Deletes any
208 * trailing blanks and appends a newline.
210 * max in buffer: MAX(ibs, cbsz) + cbsz
211 * max out buffer: obs + cbsz
220 /* Translation and case conversion. */
221 if ((t = ctab) != NULL)
222 for (cnt = in.dbrcnt, inp = in.dbp; cnt--;) {
227 * Copy records (max cbsz size chunks) into the output buffer. The
228 * translation has to already be done or we might not recognize the
231 for (inp = in.db; in.dbcnt >= cbsz; inp += cbsz, in.dbcnt -= cbsz) {
232 for (t = inp + cbsz - 1; t >= inp && *t == ' '; --t)
236 (void)memmove(out.dbp, inp, cnt);
241 if (++out.dbcnt >= out.dbsz)
245 (void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
246 in.dbp = in.db + in.dbcnt;
256 warnx("%s: short input record", in.name);
257 for (t = in.db + in.dbcnt - 1; t >= in.db && *t == ' '; --t)
261 (void)memmove(out.dbp, in.db, cnt);